(I’m tidying up a particularly messy shelf when a customer comes up to me. He doesn’t announce himself or say, “Excuse me,” so he takes me by surprise.)

Customer: “Do you sell cassettes here?”

Me: “I’m sorry, sir! I was in a world of my own! What is it you were looking for?”

Customer: “Cassettes. Do you sell them?”

Me: “No, sorry, sir. We don’t sell cassettes.”

Customer:*in a condescending tone* “Do you even know what they are?”

Me: “Yes, sir. I used them when I was growing up in the 90s. Used to use them to record my favourite songs off the radio. Unfortunately, not a lot of supermarkets sell them these days, but you could perhaps try charity shops or look online. Is there anything else I can help you with today?”

(The man looked shocked; I obviously appear too young to even know what cassettes are!)